Running Karma in your TeamCity build is as simple as adding command line build step to perform the task. That is basically it.
The only prerequisite is
npm) installed on the agent(s) you are going to use to
run build on.
You may decide to install Karma and Karma-related packages on the agent globally to reuse the same
Karma installation by different builds.
karma-teamcity-reporter as a dependency to your project:
npm i --save-dev karma-teamcity-reporter
It is also a good idea to check that you have all karma npm dependencies listed in your
package.json file (e.g.
karma-phantomjs-launcher and so on) to have them
being installed during the build.
Add new build step to the build configuration: use Command Line runner and fill in
Custom script text area. If you had decided not to install all your NPM dependencies globally
npm install at the beginning of the script. Then add command to run Karma, e.g.:
karma start --reporters teamcity --single-run --browsers PhantomJS --colors false
Running Karma with all these options provided via command line allows to run Karma in TeamCity build and locally in development environment (with options from configuration file).